If you face duplicate content, make refine sections with refine content

Some more excerpts from Tedster's take on this article:

A major focus of all these changes was tightening up the number of links (300 per page was outrageous!) and thereby helping Google understand the sites themes much better. All that improves organic traffic. That explains a lot of the above questions about reasons for various actions. Note that the whole of this report was NOT second-guessing Panda itself, but rather aligning the site to best practices, period.

The data you see above is from 2010. THAT major drop was from Google's MayDay update. As you can see, daily organic visits plummeted as a result of the MayDay update. That's something I see in about 40% of the Panda audits I've done.